21 Jul
2016
21 Jul
'16
6:11 p.m.
From: Tony Duell
If it's anything like the 11/44 ... the memory bus
is carried on the A
and B connectors, the peripheral bus on the C,D,E,F connectors.
I have yet to totally grok the -11/44, but the documentation indicates the
slots for memory are memory only (i.e. EUB on the A/B connectors). Are you
saying they are also SPC on the C/F connectors? (If so, ever tried plugging an
SPC device into a 'memory' slot? :-)
If so, that would make it very similar to the -11/24, then - although does it
also have the thing where the data lines are connected from the EUB (connector
A) to the SPC UNIBUS (connector C)? The CPU prints show data from the CPU
going to connector A, unlike the -11/24, which sends data to C - although if
the backplane has the EUB and SPC data busses connected, it would all be the
same in the end.
Noel
21 Jul
21 Jul
6:37 p.m.
> If it's anything like the 11/44 ... the
memory bus is carried on the A
> and B connectors, the peripheral bus on the C,D,E,F connectors.
I have yet to totally grok the -11/44, but the
documentation indicates the
slots for memory are memory only (i.e. EUB on the A/B connectors). Are you
saying they are also SPC on the C/F connectors? (If so, ever tried plugging an
SPC device into a 'memory' slot? :-)
I thought there were the SPC signals on at least some of the memory
slots, but I can't find the module allocation diagram right now.
If so, that would make it very similar to the -11/24,
then - although does it
also have the thing where the data lines are connected from the EUB (connector
A) to the SPC UNIBUS (connector C)? The CPU prints show data from the CPU
I would think so. The memory management circuitry and Unibus Map affect
the address lines. There is one 16 bit data bus for memory and peripherals
in these machines I think.
-tony
3100
days inactive
3100
days old
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